11.—(1) The licence holder must not discharge, intentionally or unintentionally, waste concrete, slurry or wash water from concrete or cement works into the River. The licence holder must contain and site concrete and cement mixing and washing areas at least 10 metres from any watercourse or surface water drains to minimise the risk of run off entering the River.
(2) If concrete is to be sprayed, suitable protective sheeting must be provided to prevent rebounded or windblown concrete from entering the water environment.
(3) Rebounded concrete material must be cleared away before protective sheeting is removed.